John Rambo
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John Rambo's Discussions

Servo gimbals can't be activated on Apm 3.2.1 + MP 1.3.38.1

Started Jun 23, 2016 0 Replies

Having played with the MP settings for the entire day I don't seem to be able to enable gimbal control from MP. Its greyed-out by default (see TYPE field in the picture), while it should show…Continue

Tags: copter, apm, gimbal

a nice twincopter contept...

Started this discussion. Last reply by Dan Neault Mar 23, 2012. 1 Reply

...and even more nice tiny ramjet conteptrecently fount http://www.conceptruin.com/thought will share this beautiful video with you…Continue

 

John Rambo's Page

Latest Activity

John Rambo commented on Patrick Hanley's blog post Hanley Innovations Upgrades Stallion 3D to Version 5.0
"Guys, how about NAFEMS compliance? Flow over the standard sphere, flat plate etc.? Or, let me put it other way around - how accurate it is?"
Jul 28
John Rambo commented on Chris Anderson's blog post How do modern open source autopilots compare to aerospace-grade IMUs?
"The device itself must contain aerospace graded IC components inside. The components graded for aerospace are -55C to 125C (with a standard being -40C and military grade being -65C). Price difference is 20-40%. Another thing is tripple a redundancy…"
Jun 23
John Rambo commented on OG's blog post New Design 50KW BLDC BRUSHLESS MOTOR 150HP MOTOR http://OFFTHEGRIDWATER.CA
"Similar symbol, different meaning. I'd guess the author has simply swapped KV (kiloVolts/RPM) with KW (KiloWatts)"
Jun 2
John Rambo commented on Bart Theys's blog post Which one has the highest range: VTOL, helicopter, multi-rotor (or flying squirrel?)
"A good article indeed, but all the math could have been simply replaced with a single formula and a single chart - "an advance ratio" (http://www.nar-associates.com/technical-flying/propeller/cruise_propeller_efficiency_screen.pdf)."
Jun 1
John Rambo replied to Anton Vanhoucke's discussion 433 Mhz dipole vs. GPS: total decimation
"Had problem similar to yours. Came up with a two solutions: 1) reduce the power output of the 433MHz transceiver. That's a poor man's fix. 2) replace dipole with ground-plane antenna (nose-down, ground-facing). That virtualy doubles 433MHz…"
Jun 28, 2016
John Rambo posted a discussion

Servo gimbals can't be activated on Apm 3.2.1 + MP 1.3.38.1

Having played with the MP settings for the entire day I don't seem to be able to enable gimbal control from MP. Its greyed-out by default (see TYPE field in the picture), while it should show "SERVO".Ports A10 & A11 do not show any signals generated.Anyone having similar problems? Might be this field is for 3.3+ firmwares?See More
Jun 23, 2016
John Rambo commented on Tersus GNSS's blog post Precis-BX305 Static RTK Results Released
"I might sound noobish, but how on earth do you determine N & E error. I mean, how do you know the coordinates of a fixed point(i.e. base-station) you're measuring error against, with such level of accuracy?"
Jun 17, 2016
John Rambo commented on Martin Hill's blog post Long Endurance Drone RC Airship
"Martin, is that the same airship from your previous post? Would be interesting to see how it swims in the air. And because you've stabilized the video, its even more difficult to understand its true orientation. Was there any wind during the…"
Jun 14, 2016
John Rambo commented on Jacek Szostak's blog post Do you need some nice LRS 433MHz antenna ? - do it yourself !
"@Jacek, where did you get that "Flex Wire" from? Tried googling on that keyword with no luck."
Apr 25, 2016
John Rambo commented on Jacek Szostak's blog post Do you need some nice LRS 433MHz antenna ? - do it yourself !
"I ran a similar test last year.  Hand-made Inverted-Vee gave me the best performance."
Apr 25, 2016
John Rambo commented on Martin Hill's blog post RC Airship as Drone
"@Marthin H., the problem with blimps is -  they can't be small and efficient, just like quad's can't.  it seems your L/D ratio is 6:1? That's not a shape which gives you a smallest drag possible. I've done a study…"
Apr 1, 2016
John Rambo commented on CSG's blog post 433MHz Super Long Distance FHSS LoRa Wireless data modem with USB UART 5+ km range
"I've made it 73km with a simple dipole antenna attached to RF1276 (SX1276), and would have gone more, if I were higher, as I've reached a horizon limit. -148dB RX sensitivity. Not willing to promote anything, but 168dB link…"
Mar 22, 2016
John Rambo commented on Kieran Schmidt-Das's blog post Weight vs Battery life..... Thank you for making this possible
"I was always wondering why it is recommended to hover at ~50% max. throttle? Also, I was always wondering why people are checking max. thrust for evaluating max. lift capability? Propeller/motor has a max. efficiency at ~20% of its max. thrust. So,…"
Mar 14, 2016
John Rambo commented on Andrew Ocejo's blog post DIY HDMI video Downlink for under $300
"thanks Andrew, now I'm back to my experiments of replacing IP comms with FCOE on RbPi-based video streaming."
Mar 8, 2016
John Rambo commented on Andrew Ocejo's blog post DIY HDMI video Downlink for under $300
"Andrew, can you please confirm this is not a typo error and you were really able to achieve 250 microseconds delay? That's some 700x better than the current setup drones community has been using (RbPi + RbPi camera gives some 170ms)"
Mar 7, 2016
John Rambo commented on Simon Howroyd's blog post Efficient Powerpath Balancing for Fuel Cell Battery Hybrid Powertrains
"@Martin - here's the URLto schematics and firmware I must also apologize Simon for hijacking his original thread. Your problems seems rather obvious - your battery can't handle high currents or has relatively high internal resistance…"
Feb 22, 2016

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the serious guy
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